Yep its definitely possible, I have the following in my car (2005 ba MKII);

Glass Break Sensor,Air Mass Sensor,Tilt Sensor,Extra Speak thing so its not just the horn that makes noise and with added battery in a locked box so even if they disconnect the battery the alarm keeps going.Also Automaticly locks all the doors when the car is started, and when the car is turned off all the windows go up automatically.

It's dynamco gear for the siren and alarm , http://www.dynamco.com.au/ and the other stuff was gear my mate who used to be a pro installer had laying around spare. Not sure on brand names. It worth noting I had to get rid of the factory remote.

my ba mk2 has whats called an upgrade alarm. keeps the factory remote, but gets sensors for doors boot and bonnet and glass break, plus back up battery. cost $300 installed. think its called autowatch or something

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